//! Compiled-in static assets: the stylesheet, fonts and icons.

use axum::extract::Path;

use axum::http::{header, StatusCode};

use axum::response::{IntoResponse, Response};

const CSS: &str = include_str!("../../../../templates/style.css");

const FAVICON: &str = include_str!("../../../../assets/icons/oxygenhub.svg");

/// A short hash of the stylesheets and script the pages link, put in their

/// URLs (`?v=…`): they are served for a long time and cached by any proxy

/// in front of the hub (Cloudflare held a day-old stylesheet), so a new

/// version must have a new URL.

pub fn assets_version() -> &'static str {

    static V: std::sync::OnceLock<String> = std::sync::OnceLock::new();

    V.get_or_init(|| {

        let mut h = blake3::Hasher::new();

        h.update(CSS.as_bytes());

        for a in ASSETS.iter().filter(|a| {

            matches!(

                a.path,

                "github.css"

                    | "hub.js"

                    | "early.js"

                    | "pulse.js"

                    | "backdrop-boot.js"

                    | "report-frame.js"

                    | "report.css"

                    | "backdrop/backdrop.js"

                    | "backdrop/backdrop_bg.wasm"

            )

        }) {

            h.update(a.bytes);

        }

        h.finalize().to_hex()[..12].to_string()

    })

}

struct Asset {

    path: &'static str,

    mime: &'static str,

    bytes: &'static [u8],

}

const ASSETS: &[Asset] = &[

    Asset { path: "fonts/Barlow-300.woff2", mime: "font/woff2", bytes: include_bytes!("../../../../assets/fonts/Barlow-300.woff2") },

    Asset { path: "fonts/Barlow-400.woff2", mime: "font/woff2", bytes: include_bytes!("../../../../assets/fonts/Barlow-400.woff2") },

    Asset { path: "fonts/Barlow-500.woff2", mime: "font/woff2", bytes: include_bytes!("../../../../assets/fonts/Barlow-500.woff2") },

    Asset { path: "fonts/Barlow-600.woff2", mime: "font/woff2", bytes: include_bytes!("../../../../assets/fonts/Barlow-600.woff2") },

    Asset {

        path: "fonts/PressStart2P-400.woff2",

        mime: "font/woff2",

        bytes: include_bytes!("../../../../assets/fonts/PressStart2P-400.woff2"),

    },

    Asset { path: "github.css", mime: "text/css; charset=utf-8", bytes: include_bytes!("../../../../assets/github.css") },

    Asset { path: "hub.js", mime: "text/javascript; charset=utf-8", bytes: include_bytes!("../../../../assets/hub.js") },

    // What pages ran inline before the CSP was enforced (#227): the look

    // and theme before first paint, the pulse chart, the backdrop's start.

    Asset { path: "early.js", mime: "text/javascript; charset=utf-8", bytes: include_bytes!("../../../../assets/early.js") },

    Asset { path: "pulse.js", mime: "text/javascript; charset=utf-8", bytes: include_bytes!("../../../../assets/pulse.js") },

    Asset {

        path: "backdrop-boot.js",

        mime: "text/javascript; charset=utf-8",

        bytes: include_bytes!("../../../../assets/backdrop-boot.js"),

    },

    // For report frames (#127): the size and theme bridge the hub adds to

    // a report's pages, and the stylesheet a report may link.

    Asset { path: "report-frame.js", mime: "text/javascript; charset=utf-8", bytes: include_bytes!("../../../../assets/report-frame.js") },

    Asset { path: "report.css", mime: "text/css; charset=utf-8", bytes: include_bytes!("../../../../assets/report.css") },

    // Backdrops (docs/backgrounds.md, #157): the engine, Rust compiled to

    // WebAssembly (crates/backdrop), and its wasm-bindgen glue, both

    // written by `make backdrop`.

    Asset {

        path: "backdrop/backdrop.js",

        mime: "text/javascript; charset=utf-8",

        bytes: include_bytes!("../../../../assets/backdrop/backdrop.js"),

    },

    Asset {

        path: "backdrop/backdrop_bg.wasm",

        mime: "application/wasm",

        bytes: include_bytes!("../../../../assets/backdrop/backdrop_bg.wasm"),

    },

    Asset {

        path: "vendor/editor.js",

        mime: "text/javascript; charset=utf-8",

        bytes: include_bytes!("../../../../assets/vendor/editor.js"),

    },

    Asset {

        path: "vendor/easymde.min.js",

        mime: "text/javascript; charset=utf-8",

        bytes: include_bytes!("../../../../assets/vendor/easymde.min.js"),

    },

    // Mermaid 12.1.0 (MIT, assets/vendor/mermaid.LICENSE), from npm's

    // mermaid package, dist/mermaid.min.js; loaded only by pages with a

    // diagram.

    Asset {

        path: "vendor/mermaid.min.js",

        mime: "text/javascript; charset=utf-8",

        bytes: include_bytes!("../../../../assets/vendor/mermaid.min.js"),

    },

    Asset { path: "wasi-worker.js", mime: "text/javascript; charset=utf-8", bytes: include_bytes!("../../../../assets/wasi-worker.js") },

    Asset { path: "wasm-tab.js", mime: "text/javascript; charset=utf-8", bytes: include_bytes!("../../../../assets/wasm-tab.js") },

    Asset {

        path: "vendor/easymde.min.css",

        mime: "text/css; charset=utf-8",

        bytes: include_bytes!("../../../../assets/vendor/easymde.min.css"),

    },

];

const CACHE: &str = "public, max-age=86400";

pub async fn style() -> Response {

    ([(header::CONTENT_TYPE, "text/css; charset=utf-8"), (header::CACHE_CONTROL, CACHE)], CSS).into_response()

}

pub async fn favicon() -> Response {

    ([(header::CONTENT_TYPE, "image/svg+xml"), (header::CACHE_CONTROL, CACHE)], FAVICON).into_response()

}

pub async fn asset(Path(path): Path<String>) -> Response {

    match ASSETS.iter().find(|a| a.path == path) {

        // Readable across origins: a report's sandboxed frame has an

        // opaque origin, and loads fonts in CORS mode (#127).

        Some(a) => (

            [

                (header::CONTENT_TYPE, a.mime),

                (header::CACHE_CONTROL, "public, max-age=31536000, immutable"),

                (header::ACCESS_CONTROL_ALLOW_ORIGIN, "*"),

            ],

            a.bytes,

        )

            .into_response(),

        None => StatusCode::NOT_FOUND.into_response(),

    }

}